Here comes Batman spreading his "pro-fuse propaganda" again...
Most of my guns I custom wire myself (tech work at Batteries Plus taught me a lot of cool tricks), and I purposely wire in a fuse box for all of them. I'm not going to tell you that fuses are essential to proper AEG health, because they aren't. I just believe that the level of safeguard they provide for your gun is much greater than the amount of hassle they are to keep in. Some points:
Pros:
-When an AEG hits a mechanical failure or wiring problem (which is practically inevitable), the fuse is much faster at reacting than you are. It will break the connection before more serious problems arise. I've seen batteries, wires, pistons, gears and numerous other internal parts saved by the fuse stopping the cycle MANY a time. Inversely, I've seen the same parts destroyed in guns that would have been saved if there was a fuse.
-Fuses are CHEAP. A LOT cheaper than any part inside your gearbox.
Cons:
-They take up extra space in your gun. Some guns are designed to fit wires or the battery in such a tight space that a fuse is impossible to fit. It's not the end of the world, but be more careful with how you use it.
-Because of resistance, fuses do slightly decrease your ROF... BUT with good quality wires, connectors, and fuses, the problem is virtually non-existent.
Other points:
-If your gun is constantly blowing fuses, you are either using the wrong rated fuses, or there is SOMETHING WRONG WITH YOUR GUN. Fuses don't just blow for no reason. Try higher rated fuses; I prefer 30A.
-When you install a higher tension spring in your gun, resistance increases, which means you need higher rated fuses than before. A lot of people overlook this.
-If you're using a mosfet, you don't need a fuse.
-Fuses DO NOT drain batteries faster. When the connection is closed, amperage flows through a fuse just the same as a piece of wire. It doesn't stockpile "mAh's" inside of it.
There is a decent likelihood that you could play airsoft for years and years, and never see a problem that a fuse would have prevented... but I have... LOTS of times. So, I therefore use fuses, and am glad I do.
-BATMAN